Zn-W/TiO_2宽温度窗口SCR催化剂在燃煤烟气中的应用  

APPLICATION RESEARCH ON Zn-W/TiO_2 SCR CATALYST WITH WIDE OPERATION TEMPERATURE WINDOW TO THE COAL-FIRED FLUE GAS

作　　者：李燕 刘毅[1] 王鹏 韩涛 余学海 赵瑞 廖海燕 LI Yan;LIU Yi;WANG Peng;HAN Tao;YU Xue-hai;ZHAO Rui;LIAO Hai-yan(Shenhua Guohua (Beijing)Electric Power Research Institute Co.,Ltd.,Beijing 100025,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,Zhengjiang.Provinee,China)

机构地区：[1]神华国华(北京)电力研究院有限公司,北京100025 [2]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《环境工程》2018年第11期89-93,117,共6页Environmental Engineering

基　　金：国家科技支撑计划项目"大型燃煤电站近零排放控制关键技术及工程示范"(2015BAA05B02)

摘　　要：为拓宽SCR催化剂的工作温度,研究宽温度窗口SCR催化剂在实际烟气条件中的应用对燃煤机组适应负荷波动、实现氮氧化物的超低排放具有重要意义。通过5×10~4 m^3/h的燃煤烟气污染物脱除试验平台,研究了Zn-W/TiO_2宽温度窗口SCR催化剂在不同温度窗口下的脱硝性能、氨逃率及连续运行300 h后催化剂效率及阻力的变化。结果表明:该催化剂在275～320℃性能稳定,当催化剂层温度为275℃、入口ρ(NO_x)为115.00～130.00 mg/m^3时,可保证NO_x出口浓度<20 mg/m^3。NH_3逃逸在低温窗口运行时略高于常规温度窗口,但仍<2.50 mg/m^3。综合各项指标分析,建议该催化剂运行效率<91.0%。Extending the operation temperature window of SCR catalyst and researching the application of SCR catalyst with wide operation temperature window on the coal-fired flue gas are of great significance to realize the ultra-low emission of nitrogen oxides in case of long-term load reduction of coal-fired units.A Zn-W/TiO2 SCR catalyst with wide operation temperature window was applied on the 5×10^4m^3/h test platform of pollutant removal.The performance of the catalyst at different temperature was analysed.Researches show that it is stable between 275℃ and 320℃.When the SCR system inlet concentration of NOx in the range of 115.00-130.00mg/Nm^3,the outlet NOx concentration can be cut down to a level lower than 20mg/Nm^3at 275℃.The escape of NH3 at low temperature show little higher than at high temperature,but which is still lower than 2.50mg/Nm^3.Considering various indicators,the running de-nitration efficiency is suggested to be no more than 91.0%.

关 键 词：燃煤烟气 氮氧化物 选择性催化还原技术 宽温度窗口SCR催化剂 NH3逃逸 

分 类 号：X773[环境科学与工程—环境工程]